#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>

int main()
{
	int a = 0;
	int b = 0;
	int c = 0;
	scanf("%d%d%d", &a, &b, &c);
	if (a + b > c && a - b < c)
	{
		if (a == b && b == c)
			printf("Equilateral triangle!");
		else if (a != b && a != c && b != c)
			printf("Ordinary triangle!");
		else
			printf("lsosceles triangle!");
	}
	else
		printf("Not a triangle!");
	return 0;
}